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Volcanic eruptions can inject millions of tonnes of dust and gaseous sulfur dioxide into the stratosphere. The finer dust particles remain aloft for years and spread around the world

The dust and aerosol produce vivid sunset and twilight effects like the intense purple glow is probably a combination of red-orange light transmitted through the lower atmosphere and scattered blue light from still sunlit stratospheric dust.

Red | Purple | Sky | Night | Sunset | Mountain | Evening